Thalus therome

1.	Thalus therome
Answer» For the theorem sometimes called Thales\'s theorem and pertaining to similar triangles, see Intercept theorem.Thales\'s theorem: if AC is a diameter, then the angle at B is a right angle.In geometry, Thales\'s theorem states that if A, B, and C are distinct points on a circle where the line AC is a diameter, then the angle ∠ABC is a right angle. Thales\'s theorem is a special case of the inscribed angle theorem, and is mentioned and proved as part of the 31st proposition, in the third book of Euclid\'s Elements.[1] It is generally attributed to Thales of Miletus, who is said to have offered an ox (probably to the god Apollo) as a sacrifice of thanksgiving for the discovery, but sometimes it is attributed to Pythagoras.

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